Sirzechs Lucifer

Sirzechs Lucifer, formerly known as Sirzechs Gremory, is a hero in High School DxD. He was the Satan Lucifer who was in charge of Domestic Affairs, prior to the events of 666. He is the former heir to the Gremory Clan and is the father of Millicas Gremory, the only son and eldest child of Zeoticus and Venelana Gremory, the older brother of Rias Gremory, and the husband of Grayfia Lucifuge. Known as the Crimson Satan, he is the former leader of the Four Great Satans who ruled the Underworld with the title of "Lucifer".

Personality
As a Gremory, Sirzechs is shown to be very kind and caring towards others and prefers to have things sorted out through talking instead of fighting. Sirzechs has a very laid-back personality, preferring to do things at his own pace which his wife would usually punish him for. In fact, when he's up to his usual antics, the mere mention of his wife's name is enough to make him apologize immediately. Sirzechs, however, does have a serious side to him which he has only revealed twice, during his fight against Creuserey Asmodeus and his confrontation with Hades. Sirzechs is considered as a siscon because of his deep love for his younger sister, Rias Gremory, and as an overprotective and loving father for his son Millicas Gremory. Sirzechs also has a childish and playful side, shown when he deeply enjoyed posing as Satan Red while playing with his son Milicas, but then becoming upset over his son choosing Oppai Dragon over Satan Red acting in a rather childish manner.

Sirzechs is revealed to have a perverted side which is directed solely on Grayfia, as he stated to Issei he is free of distraction when he gropes his wife's breasts

Trivia

 * In Funimation's subtitles, Sirzechs' name is erroneously misspelled as Sir Zechs.
 * Sirzechs' name is derived from the names of two characters from the Gundam TV series, Char Aznable of Mobile Suit Gundam 0079 and Zechs Merquise of Mobile Suit Gundam Wing.
 * Despite being the decesendant of Satan, Sirzechs is a hero.